Merge branch 'changelog-in-release-notes' into 'main'

Add changelog entries to release notes

See merge request components/opentofu!159

.gitlab/release-notes.md.template

 Release $CI_COMMIT_TAG of components repository $CI_PROJECT_PATH.
 
-See the [CHANGELOG](CHANGELOG.md) for what changes happened in this release.
+## Changelog
+
+$CHANGELOG
+
+See the [CHANGELOG.md](CHANGELOG.md) file for the entire history.
 
 ## Usage
 

.gitlab/scripts/release-notes.sh

@@ -9,4 +9,7 @@ export AVAILABLE_OPENTOFU_VERSIONS
 AVAILABLE_IMAGES="$(cat image*.md | sort -r | tee images.md | sed -E "s/(\(digest: .*\))/\n  - \1/")"
 export AVAILABLE_IMAGES
 
+CHANGELOG="$(awk '/^## /{i++} i==1 && NR>1' CHANGELOG.md)"
+export CHANGELOG
+
 envsubst < .gitlab/release-notes.md.template